VO₂ max is the single strongest predictor of how long — and how well — you'll live. It's also the number your training plateaus on. MAXIMUS trains the one limiter; nothing else touches.

MAXIMUS puts resistance on your exhale while you exercise. That raises CO₂ in a controlled way. Your body adapts to tolerate it. And with the breathing limiter out of the way, you can finally train at the intensities that build your VO₂ max.

THE HIDDEN LIMITER

The urge to breathe isn't triggered by low oxygen. It's triggered by rising CO₂.

Your body has a built-in CO₂ alarm. When CO₂ climbs during hard effort, it fires: breathe harder, back off, stop.A nd for most people, that alarm is oversensitive. It goes off early, pulling you out of the effort before your body actually needs to quit.

That's the ceiling you keep hitting. Not your heart. Not your legs. Your breathing.

The good news: you can train that alarm to stop crying wolf. It's called CO₂ tolerance, and almost nobody trains it.

Freedivers do.

Elite endurance athletes do.

Now you can.